blob: 8a771d6fc280f7772dba838e72c071589d0f0647 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
|
package hostarch
// A Range represents a contiguous range of T.
//
// +stateify savable
type AddrRange struct {
// Start is the inclusive start of the range.
Start Addr
// End is the exclusive end of the range.
End Addr
}
// WellFormed returns true if r.Start <= r.End. All other methods on a Range
// require that the Range is well-formed.
//
//go:nosplit
func (r AddrRange) WellFormed() bool {
return r.Start <= r.End
}
// Length returns the length of the range.
//
//go:nosplit
func (r AddrRange) Length() Addr {
return r.End - r.Start
}
// Contains returns true if r contains x.
//
//go:nosplit
func (r AddrRange) Contains(x Addr) bool {
return r.Start <= x && x < r.End
}
// Overlaps returns true if r and r2 overlap.
//
//go:nosplit
func (r AddrRange) Overlaps(r2 AddrRange) bool {
return r.Start < r2.End && r2.Start < r.End
}
// IsSupersetOf returns true if r is a superset of r2; that is, the range r2 is
// contained within r.
//
//go:nosplit
func (r AddrRange) IsSupersetOf(r2 AddrRange) bool {
return r.Start <= r2.Start && r.End >= r2.End
}
// Intersect returns a range consisting of the intersection between r and r2.
// If r and r2 do not overlap, Intersect returns a range with unspecified
// bounds, but for which Length() == 0.
//
//go:nosplit
func (r AddrRange) Intersect(r2 AddrRange) AddrRange {
if r.Start < r2.Start {
r.Start = r2.Start
}
if r.End > r2.End {
r.End = r2.End
}
if r.End < r.Start {
r.End = r.Start
}
return r
}
// CanSplitAt returns true if it is legal to split a segment spanning the range
// r at x; that is, splitting at x would produce two ranges, both of which have
// non-zero length.
//
//go:nosplit
func (r AddrRange) CanSplitAt(x Addr) bool {
return r.Contains(x) && r.Start < x
}
|
